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| Number | Title | Issue Date |
| 7299894 | Acoustic fluid machine An acoustic fluid machine includes an acoustic resonator, a valve device, a piston, and an actuator. The acoustic resonator has a larger-diameter base and a smaller-diameter upper end. The valve device is provided on the upper end of the acoustic resonator and has a... | 11/27/2007 |
| 7136324 | Pressure equalizing fluidborne sound projector A solid metallic piston of a fluidborne sound projector is provided with a plurality of parallel spaced fluid passages extending between opposite axial end faces of the piston so as to equalize fluid pressures exerted thereon within a chamber enclosed within an end ... | 11/14/2006 |
| 7130246 | Acoustic fluid machine An acoustic fluid machine has an acoustic resonator and a piston reciprocated by an actuator at the base of the acoustic resonator. A valve device is provided on the upper end of the acoustic resonator. External air is introduced into the acoustic resonator through ... | 10/31/2006 |
| 7059575 | Industrial tank support An industrial tank support includes a platform and multiple supporting legs positioned around the platform with the platform located between the top end and bottom end of the legs. The platform has first and second surfaces thereon which have different configuration... | 06/13/2006 |
| 6751161 | Fluidborne sound projector with sweep cleaning facilities An acoustic projector device having a piston exposed to pressure balanced air and water in an acoustically ideal position thereof within a piston chamber enclosing sleeve disposed in an outer housing to which deaerating water is selectively supplied in surrounding r... | 06/15/2004 |
| 6464035 | Streamlined, readily towable marine seismic energy source for creating intense swept-frequency and pulse-coded signals in a body of water Streamlined, towable, marine seismic energy vibrator for creating intense swept-frequency and pulse-coded seismic signals in a body of water has a sleek, fish-like configuration designed for towing with minimum drag. The vibrator has a streamlined hollow ... | 10/15/2002 |
| 6320821 | Fluidborne sound projector A fluidborne projector of sound derived from an electro-mechanical noise source translates acoustical energy through a piston subjected to balanced pressures of gas and liquid to enabled dynamic displacement thereof. Such displacement of the piston to a s... | 11/20/2001 |
| 6173803 | High amplitude sound wave generator A method and device for generating a high amplitude sound wave is provided. The device includes a housing having an open end. A piston is slidably disposed in the open end of the housing and forms a chamber for holding a pressurized liquid. The pressurize... | 01/16/2001 |
| 6148952 | Hydraulic slotted cylinder source An apparatus for generating acoustic source energy in a liquid medium. A slotted cylinder has an interior volume filled with a fluid. An actuator selectively pressurizes the fluid to expand the slotted cylinder. Movement of the slotted cylinder due to exp... | 11/21/2000 |
| 5894451 | Impulsive snap-through acoustic pulse generator An impulsive snap-through acoustic pulse generator may be used to generate n acoustic pulse in an aqueous environment without gas bubbles. The impulsive snap-through acoustic pulse generator includes a support structure having an open end; a resilient shel... | 04/13/1999 |
| 5467322 | Water hammer driven vibrator The invention provides apparatus for shaking structures such as fins in a fluid agitator, shaking tables, shaking screens, conveyors, or the walls of bins or hoppers. The apparatus is driven by a hydraulic driving system in which high pressure pulses are ... | 11/14/1995 |
| 5459699 | Method and apparatus for generating high energy acoustic pulses A method and apparatus are disclosed for generating intense acoustic pulses by means of the water hammer effect. The method involves generating a water hammer in a conduit by suddenly interrupting a high velocity flow of fluid through the conduit. The kin... | 10/17/1995 |
| 5375100 | Gas-operated apparatus for making a noise under water Gas-operated apparatus (2) for making a noise underwater, comprising a body (4), a diaphragm (6) which extends over the body (4) to define a chamber (8) between the body (4) and the diaphragm (6), a gas inlet nozzle (10) which extends into the chamber (8)... | 12/20/1994 |
| 5319610 | Hydraulic acoustic wave generator system for drillstrings An acoustic wave generator for telemetering signals through a drillstem comprises a sub interposed in the drillstem with a central mandrel and a piston mass disposed in sleeved relationship around the mandrel and reciprocable by hydraulic pressure fluid t... | 06/07/1994 |
| 5128900 | Multi-component seismic vibratory source for use in marine environments The method and apparatus for providing elliptical polarized shear waves in a marine environment in which a shear wave source penetrates the surface sediment of a water bottom includes dual actuator/reaction mass system mounted inside a structural ring of ... | 07/07/1992 |
| 5128906 | Deep penetrating shear-wave seismic vibratory source for use in marine environments A method and apparatus for providing shear waves in a marine environment in which a shear wave source penetrates the surface sediment of a water bottom. The shear wave generating source includes an actuator/reaction mass system mounted inside a structural... | 07/07/1992 |
| 5115880 | Piezoelectric seismic vibrator with hydraulic amplifier A piezoelectric seismic vibrator is disclosed which utilizes a hydraulic system to amplify the longitudinal displacement which results from the application of a voltage to a stack of piezoelectric elements. In each disclosed embodiment of the present inve... | 05/26/1992 |
| 4885726 | Compound hydraulic seismic source vibrator A seismic source marine vibrator having compound hydraulic cylinders for high and low frequencies is used to generate both low frequency and high frequency acoustic pulses. Low frequency pulses are generated by operating a low frequency radiating surface ... | 12/05/1989 |
| 4881211 | Multiple frequency range hydraulic actuator A multiple frequency range hydraulic actuator includes a low frequency cylinder with a low frequency actuator piston within. The low frequency piston operates as a high frequency cylinder having a high frequency piston within. The low frequency piston, an... | 11/14/1989 |
| 4853905 | Seal for marine seismic source A marine seismic vibrator includes a housing having first and second housing portions defining an internal chamber therebetween. A hydraulic cylinder or other energizing device is connected between the first and second housing portions. The first and seco... | 08/01/1989 |
| 4815557 | Down hole seismographic source A seismic energy source provides a bias pressure and oscillating pressure force on a piston mounted transversely to the major axis of the well bore and in pressure contact with the wall of the well bore. A seismographic energy wave is generated in the sur... | 03/28/1989 |
| 4797862 | Seismic generator The method and apparatus for generating seismic vibrations in a liquid includes an electronically controlled, hydraulically powered generator that includes a piston assembly reciprocally mounted on a cylindrical post in a generator housing. The control ap... | 01/10/1989 |
| 4751687 | Methods of reducing harmonic distortion in continuous wave seismic exploration Described is a method of driving a seismic vibrator with a control signal to produce an output signal having minimized harmonic distortion. The method includes the steps of producing a plurality a harmonic distortion signals related to a fundamental frequ... | 06/14/1988 |
| 4730692 | Apparatus for marine shear wave prospecting An underwater vibrator is specifically adapted for generating a shear wave in a seabed and includes a frame; locomotion apparatus attached to the frame for moving the vibrator over the seabed; and cable means connected between a surface support vessel and... | 03/15/1988 |
| 4695987 | Hydroacoustic apparatus A hydroacoustic transducer for generating and applying acoustic energy to a load coupling structure has a hydroacoustic amplifier with a driver stage and a power stage. The power stage includes a valve, which obtains high power conversion efficiency by op... | 09/22/1987 |
| 4648478 | Device for generating sound pulses inside a well, by percussion A device for generating sound pulses in a well by a mobile mass striking against a target element integral with an elongate body anchored in a well by retractable shoes actuated by hydraulic cylinders. The mobile mass which slides in a first chamber in th... | 03/10/1987 |
| 4641725 | Wide dynamic range hydraulic vibrator An apparatus for incremental cylinder length control in a hydraulic vibrator of the type having a reaction mass with a cylinder bore disposed therein, first and second end sleeves disposed in sealed movable position in the ends of the cylinder, a piston r... | 02/10/1987 |
| 4635747 | Marine seismic vibrator having support structure including vibration isolators Mounting structure for a marine seismic vibrator comprising at least three acoustic isolators equally spaced apart about an upper housing of the vibrator. Each of the isolators comprises a pair of spaced mounting pads mechanically secured to the housing. ... | 01/13/1987 |
| 4633970 | Distributed marine seismic source The invention relates to a compact tunable subsea seismic source. The source has multiple seismic radiating plates placed symmetrically about a central housing which contains a hydraulic actuating system. The source is towed to optimize the amount of ener... | 01/06/1987 |
| 4578784 | Tunable marine seismic source The disclosed device is a marine seismic source which produces a varying FM signal often in the 10-100 Hertz region of the spectrum. The seismic source uses stiff oscillating radiators to create a signal in the water. These radiators are actuated by hydra... | 03/25/1986 |
| 4556963 | Underwater sound generator An underwater sound generator comprising dual opposed pistons in a housing. Dynamic seal assemblies of flexible waterproof material are compressed against the peripheries of the pistons and the housing and form a watertight seal that allows axial motion. ... | 12/03/1985 |
| 4483411 | Tunable marine seismic source The disclosed device is a marine seismic source which produces a varying FM signal in the low end of the acoustic spectrum. The seismic source uses stiff oscillating radiators to create a signal in the water. These radiators are attached to devices acting... | 11/20/1984 |
| 4396088 | Flexible marine seismic source The invention relates to a marine seismic source which emits an FM signal linearly increasing from 10 Hz to about 100 Hz. The source has a number of transducers which are flexible sleeves containing a pulsing hydraulic fluid.... | 08/02/1983 |
| 4334592 | Sea water hydraulic fluid system for an underground vibrator A hydraulic drive system for an underwater vibrator has a hydraulically driven mass for generating a seismic wave into the seabed. The hydraulic drive system for the vibrator is accomplished by filtering sea water, conveying the filtered sea water to the ... | 06/15/1982 |
| 4211301 | Marine seismic transducer A method and apparatus for seismic prospecting which utilizes two transducer plates that are spaced apart, with two sets of bellows placed in between and sealingly attached thereto, to transmit electrically controlled hydraulic pressure signals onto the t... | 07/08/1980 |
| 4203089 | Electro-hydroacoustic transducer An underwater transducer which includes a fluid circuit having a valve disposed in a plenum chamber having a small aperture open to the ambient water pressure. Fluid flow into and out of the chamber by way of the valve is governed by controlling the valve... | 05/13/1980 |
| 4153135 | Apparatus for the generation of acoustic signals in marine environments A source is described capable of generating acoustic signals under water at high cycling rates suitable for providing seismic signals of controlled amplitude and spectral shape and with precise timing for geophysical exploration. The source has a pair of ... | 05/08/1979 |
| 4142171 | Efficient apparatus for projecting acoustic waves In an apparatus for projecting low-frequency acoustic waves in a liquid ma, a chamber adapted to be immersed in the media contains gaseous material to provide a compliance and is provided with an aperture. A piston of selected mass is sealably mounted in... | 02/27/1979 |
| 4103280 | Device for emitting acoustic waves in a liquid medium This device comprises two movable elements of rigid material tightly interconnected by means of a deformable membrane forming therewith a tight internal enclosure, means for varying abruptly the volume of said enclosure by successively moving the two elem... | 07/25/1978 |
| 4047591 | Air gun monitoring and synchronizing method and apparatus Disclosed is an improved air gun construction which lends itself to use with a plurality or array of similarly improved air guns which enables easy synchronization and timing of such array of air guns relative to one another. The synchronization and timin... | 09/13/1977 |
